Buggy code:
public Address getContact ( SipConnection connection ) { } public SipServletRequest createRequest ( String method ) { } public SipServletHolder getHandler ( ) { } public void setHandler ( SipServletHolder handler ) { } public SipApplicationSession getApplicationSession ( ) { } public synchronized Object getAttribute ( String name ) { } public synchronized Enumeration < String > getAttributeNames ( ) { } @ Override public String getCallId ( ) { } public long getCreationTime ( ) { } public String getId ( ) { } @ Override public boolean getInvalidateWhenReady ( ) { } public long getLastAccessedTime ( ) { } @ Override public Address getLocalParty ( ) { } @ Override public SipApplicationRoutingRegion getRegion ( ) { } @ Override public Address getRemoteParty ( ) { } public String getLocalTag ( ) { } public ServletContext getServletContext ( ) { } public State getState ( ) { } @ Override public URI getSubscriberURI ( ) { } @ Override public void invalidate ( ) { } @ Override public boolean isReadyToInvalidate ( ) { } public void invalidateIfReady ( ) { } public boolean isValid ( ) { } public boolean isTerminated ( ) { } public void removeAttribute ( String name ) { } public void setAttribute ( String name , Object value ) { } public void putAttribute ( String name , Object value ) { } public void setHandler ( String name ) throws ServletException { } @ Override public void setInvalidateWhenReady ( boolean invalidateWhenReady ) { } @ Override public void setOutboundInterface ( InetSocketAddress address ) { } @ Override public void setOutboundInterface ( InetAddress address ) { } public void addServerTransaction ( ServerTransaction transaction ) { } public void removeTransaction ( Transaction transaction ) { } public List < ServerTransaction > getServerTransactions ( ) { } public void addClientTransaction ( ClientTransaction transaction ) { } public List < ClientTransaction > getClientTransactions ( ) { } public void setSubscriberURI ( URI uri ) { } public void setRegion ( SipApplicationRoutingRegion region ) { } public Session . DialogInfo getUa ( ) { } @ Override public String toString ( ) { } public boolean equals ( Object o ) { } @ Override public Session getSession ( ) { } @ Override public String dump ( ) { } @ Override public void dump ( Appendable out , String indent ) throws IOException { } private void printAttr ( Appendable sb , String name , Object value , String indent ) throws IOException { } public class DialogInfo implements ClientTransactionListener , ServerTransactionListener , Dumpable { protected long _localCSeq = 1 ; protected long _remoteCSeq = - 1 ; protected long _localRSeq = 1 ; protected long _remoteRSeq = - 1 ; protected URI _remoteTarget ; protected LinkedList < String > _routeSet ; private Object _serverInvites ; private Object _clientInvites ; protected boolean _secure = false ; public SipServletRequest createRequest ( String method ) { } public SipRequest createRequest ( SipRequest srcRequest ) { } public SipServletRequest createRequest ( SipMethod sipMethod , long cseq ) { } public SipServletRequest createRequest ( SipMethod sipMethod , String method , long cseq ) { } protected void setDialogHeaders ( SipRequest request , long cseq ) { } protected void createDialog ( SipResponse response , boolean uac ) { } protected void setRoute ( SipMessage message , boolean reverse ) { } public void handleRequest ( SipRequest request ) throws IOException , SipException { } @ Override public void handleResponse ( SipResponse response ) { } @ Override public void handleCancel ( ServerTransaction tx , SipRequest cancel ) throws IOException { } public void sendResponse ( SipResponse response , boolean reliable ) throws IOException { } private boolean isTargetRefresh ( SipMessage message ) { if ( message instanceof SipResponse ) { SipResponse response = ( ( SipResponse ) ( message ) ) ; if ( ( response . getStatus ( ) ) >= 300 ) return false ; } <START_BUG> return ( ( ( ( message . isInvite ( ) ) || ( message . isSubscribe ( ) ) ) || ( message . isNotify ( ) ) ) || ( message . isNotify ( ) ) ) || ( message . isMethod ( REFER ) ) ; <END_BUG> } protected void setRemoteTarget ( SipMessage message ) { } @ Override public void customizeRequest ( SipRequest request , SipConnection connection ) { } @ Override public void transactionTerminated ( Transaction transaction ) { } private Session . DialogInfo . ClientInvite getClientInvite ( long cseq , boolean create ) { } private Session . DialogInfo . ServerInvite getServerInvite ( long cseq , boolean create ) { } private Session . DialogInfo . ClientInvite removeClientInvite ( long cseq ) { } private Session . DialogInfo . ServerInvite removeServerInvite ( long cseq ) { } public List < SipServletResponse > getUncommitted1xx ( UAMode mode ) { } public List < SipServletResponse > getUncommitted2xx ( UAMode mode ) { } @ Override public String dump ( ) { } @ Override public void dump ( Appendable sb , String indent ) throws IOException { } class ClientInvite { private long _cseq ; private SipRequest _ack ; private SipResponse _2xx ; private Object _reliable1xxs ; public ClientInvite ( long cseq ) { } public long getCSeq ( ) { } public void addReliable1xx ( SipResponse response ) { } public boolean prack ( long rseq ) { } @ Override public String toString ( ) { } class Reliable1xxClient { private SipResponse _1xx ; public Reliable1xxClient ( SipResponse response ) { } public long getRSeq ( ) { } public SipResponse getResponse ( ) { } @ Override public String toString ( ) { } } } abstract class ReliableResponse { private static final int TIMER_RETRANS = 0 ; private static final int TIMER_WAIT_ACK = 1 ; private long _seq ; protected SipResponse _response ; private TimerTask [ ] _timers ; private long _retransDelay = TransactionImpl . __T1 ;

Fix:
return ( ( ( ( message . isInvite ( ) ) || ( message . isSubscribe ( ) ) ) || ( message . isNotify ( ) ) ) || ( message . isUpdate ( ) ) ) || ( message . isMethod ( REFER ) ) ;